# pacman -Syy openssh  安装openssh

# systemctl start sshd

#systemctl enable sshd  --相应的关闭操作就是disable

mysql -u root -p mysql 

grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;

flush privileges; # 重载系统权限
exit;

iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT

iptables -L -n # 或者: service iptables status

iptables -D INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT

service iptables save # 或者: /etc/init.d/iptables save

vi /etc/sysconfig/iptables # 加上下面这行规则也是可以的
-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT

    upstream resinserver{
        ip_hash;
        server 127.0.0.1:8000 down;
        server 127.0.0.1:8080 weight=2;
        server 127.0.0.1:6801;
        server 127.0.0.1:6802 backup;
    }

    #Ip_hash:每个请求按访问ip的hash结果分配，这样每个访客固定访问一个后端服务器，可以解决session的问题
    #down：不参与负载均衡
    #weight：比重，越大的分配的越多
    #backup：其他的非backup机器都down或者忙的时候才会请求到这台机器
```

例子:

```
一个简单的负载均衡与反向代理配合使用的例子

http{
  upstream test{
    ip_hash;
    server  127.0.0.1:8888
    server  127.0.0.1:9999
  }

  server {
    listen 80;
    server_name test.com

    location / {
      proxy_pass http://test;
      proxy_set_header Host $host:8888;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
  }
}
```

yum install gcc gcc-c++

wget http://download.redis.io/releases/redis-3.2.5.tar.gz

tar -zxvf ./redis-3.2.5.tar.gz

make

make install

vim /etc/redis.conf

# 是否以后台daemon方式运行，默认是 no，一般我们会改为 yes
daemonize no
pidfile /var/run/redis.pid
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
logfile ""
# 开启数据库的数量，Redis 是有数据库概念的，默认是 16 个，数字从 0 ~ 15
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir ./
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes

vim /etc/init.d/redis

#!/bin/sh  
#  
# redis - this script starts and stops the redis-server daemon  
#  
# chkconfig:   - 85 15  
# description:  Redis is a persistent key-value database  
# processname: redis-server  
# config:      /usr/local/redis-2.4.X/bin/redis-server  
# config:      /usr/local/ /redis-2.4.X/etc/redis.conf  
# Source function library.  
. /etc/rc.d/init.d/functions  
# Source networking configuration.  
. /etc/sysconfig/network  
# Check that networking is up.  
[ "$NETWORKING" = "no" ] && exit 0  
redis="/usr/local/bin/redis-server" 
prog=$(basename $redis)  
REDIS_CONF_FILE="/etc/redis.conf" 
[ -f /etc/sysconfig/redis ] && . /etc/sysconfig/redis  
lockfile=/var/lock/subsys/redis  
start() {  
  [ -x $redis ] || exit 5  
  [ -f $REDIS_CONF_FILE ] || exit 6  
  echo -n $"Starting $prog: "  
  daemon $redis $REDIS_CONF_FILE  
  retval=$?  
  echo  
  [ $retval -eq 0 ] && touch $lockfile  
  return $retval  
}  
stop() {  
  echo -n $"Stopping $prog: "  
  killproc $prog -QUIT  
  retval=$?  
  echo  
  [ $retval -eq 0 ] && rm -f $lockfile  
  return $retval  
}  
restart() {  
  stop  
  start  
}  
reload() {  
  echo -n $"Reloading $prog: "  
  killproc $redis -HUP  
  RETVAL=$?  
  echo  
}  
force_reload() {  
  restart  
}  
rh_status() {  
  status $prog  
}  
rh_status_q() {  
  rh_status >/dev/null 2>&1  
}  
case "$1" in  
  start)  
      rh_status_q && exit 0  
      $1  
      ;;  
  stop)  
      rh_status_q || exit 0  
      $1  
      ;;  
  restart|configtest)  
      $1  
      ;;  
  reload)  
      rh_status_q || exit 7  
      $1  
      ;;  
  force-reload)  
      force_reload  
      ;;  
  status)  
      rh_status  
      ;;  
  condrestart|try-restart)  
      rh_status_q || exit 0  
  ;;  
  *)  
      echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart| reload|orce-reload}"  
      exit 2  
esac
修改权限：
chmod 755 /etc/init.d/redis
启动服务：
service redis start
停止服务：
service redis stop
重启服务：
service redis restart

mv config0.m4 config.m4
（3） /data/php/bin/phpize
（4） ./configure --with-openssl --with-php-config=/data/php/bin/php-config，如果此步报Cannot find OpenSSL's <evp.h> 的错误执行以下命令：
    yum install openssl openssl-devel
    ln -s /usr/lib64/libssl.so /usr/lib/
然后重复（3）（4）步骤
（5）make
（6）make install，安装成功会生成一个目录里面包含openssl.so